ClipGrab is a free downloader and converter for YouTube, Vimeo, Facebook and many other online video sites.
It converts downloaded videos to MPEG4, MP3 or other formats in just one easy step.
NOTE: This is only to provide appimages, I am not the developer.

SimpleConvert is a small application to convert video and/or audio files to any filetype using ffmpeg. This application aims to provide an easy to understand interface so everyone will be able to use the power of ffmpeg.

Curlew Multimedia Converter:
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Description:
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Easy to use, Free and Open-Source Multimedia converter for Linux.
Curlew written in python and GTK3 and it depends on (ffmpeg/avconv).
Main Features:
- Easy to use with simple user interface.
- Hide the advanced...

QWinFF is a cross-platform, easy-to-use and open-source media converter GUI using FFmpeg as its backend. Featuring a rich set of pre-defined parameters, QWinFF helps users use FFmpeg easily without having to manually input command-line flags. Average users can convert multiple media files in...

Miro Video Converter has presets that will convert video to the correct sizes and formats for popular phones, iPods, and other media players. Just convert your video and copy it to your device.
Needs ffmpeg with x264 support (recompile ffmpeg src rpm on fedora)
The Download has fedora noarch...

Outreel is fast and esasy to use video
converter from Icefeast.its a beast ffmpeg
frondend for your linux system.you can
simple convert any videos into your
favourate one even in DVD format.
Download and enjoy OutReel...........

Encode is a GUI for ffmpeg (included) that allows you to convert audio and video in many different formats.
Make sure to have libfaac and libfaad aswell as limp3lame installed.
(Note: YAVTD is not included, download it from here: http://www.zevenos.com/about/yavtd)